This collection consists of the work sheets for Robert G. Layer's 1952 Harvard Ph.D. thesis, entitled "Wages, earnings, and output in four cotton textile companies in New England, 1825-1860." Layer culled the raw data for his numbers, later published in Earnings of Cotton Mill Operatives, 1815-1914 (Cambridge, MA: Committee in Research in Economic History, 1955) , from a number of Baker Library manuscript collections of textile mill records. The sheets contain detailed information from payrolls, including, specifically, women's payrolls, from 1828 to 1891.